Schimmel Othmar, Kohlrausch Armin
Eindhoven University of Technology, P.O. Box 513, NL-5600 MB Eindhoven, The Netherlands.
J Acoust Soc Am. 2008 Feb;123(2):986-97. doi: 10.1121/1.2821979.
The perception of a composite sound's temporal cues, like synchronous onsets, is considered essential to correct perceptual grouping of its constituent components. The processing of a single sound's spatial cues, already present at its onset, may interact with temporal perception of the onset. The current study investigated the influence of interaural differences on temporal perception of a sound's onset. As a measure of temporal perception, the ability to position the onset of a temporally displaced target sound to the regular meter of diotic reference marker sound onsets was measured for various target sound lateralizations, sensation levels, and target and marker sound durations. For target sounds presented in quiet, no influence of interaural differences on temporal positioning of the onset was found. However, increasing a sound's duration systematically shifted the perceived onset position into its "interior." For target sounds presented at low sensation levels in a noise masker, the precision of temporally positioning the onset generally degraded, though faster for dichotic conditions and for longer durations. The level below which temporal perception precision starts to degrade was found to depend on signal-to-noise ratio rather than on sensation level or duration, and is influenced by the presence of interaural differences.
对复合声音的时间线索（如同步起始）的感知，被认为对于其组成成分的正确感知分组至关重要。单个声音起始时就已存在的空间线索的处理，可能会与起始的时间感知相互作用。当前的研究调查了双耳差异对声音起始时间感知的影响。作为时间感知的一种测量方法，针对各种目标声音的侧向化、感觉水平以及目标和标记声音的持续时间，测量了将时间上移位的目标声音的起始位置定位到双耳参考标记声音起始的规则节拍的能力。对于在安静环境中呈现的目标声音，未发现双耳差异对起始时间定位有影响。然而，系统地增加声音的持续时间会将感知到的起始位置向其“内部”移动。对于在噪声掩蔽器中以低感觉水平呈现的目标声音，起始时间定位的精度通常会下降，尽管在双耳条件下和持续时间较长时下降得更快。发现时间感知精度开始下降的水平取决于信噪比，而不是感觉水平或持续时间，并且受到双耳差异的影响。
